206211440 has 40 divisors (see below), whose sum is σ = 483705648. Its totient is φ = 81751040.

The previous prime is 206211437. The next prime is 206211449. The reversal of 206211440 is 44112602.

206211440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206211449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2366 + ... + 20445.

Almost surely, 2^206211440 is an apocalyptic number.

206211440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206211440 is an abundant number, since it is smaller than the sum of its proper divisors (277494208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206211440 is a wasteful number, since it uses less digits than its factorization.

206211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22937 (or 22931 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 206211440 is about 14360.0640667095. The cubic root of 206211440 is about 590.7960527116.

The spelling of 206211440 in words is "two hundred six million, two hundred eleven thousand, four hundred forty".